| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make an analog filter for antialiasing in common without using a rate conversion by a complex operation in a sampling device. <P>SOLUTION: The software radio receiver makes sampling by setting a sampling frequency to be integral multiple of signal bands and to double a cut-off frequency or more, using: an anti-aliasing filter which has a fixed cut-off frequency fc; an AD converter and a DA converter which have a clock signal input and change the sampling frequency; and a PLL circuit which changes a clock signal frequency. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
